Nut-lock.



Patented May 5, 1903.

VALTER A. LEWIS, OF BATTLE MOUNTAIN, NEVADA, ASSIGNOR OF TWO- THIRDS TO ROBERT M. HORTON AND .IOIIN TAIN, NEVADA. Y

DIMOND, OE BATTLE MOUN- NUT-LOCK.

SPECIFICATION forming part of Letters Patent No. 727,393, dated May 5, 1903. Application funn-mary 2a 1903. Senn Nt. 14o.e7s. (No man.) i

tle Mountain, county of Landeig'State of Nevada, have invented an Improvement in Nut- Locks; and I hereby declare the following to: be a full, clear, and exact description 'of the My invention relates to improvements in means for preventing nuts from loosening on bolts. Its object is to provide a simple effective nut-locking device for use in bridgebuilding, railway construction, and Wherever there is a tendency for nuts to jar loose.

It consists of the parts andthe construction and combination of parts, as hereinafter more fully explained, having reference'to the accompanying drawings, in which- Figure lis a sectional view ofthe nut with its locking devices. Fig. 2is a sectional view of the bolt with both nuts `in engagement. Fig. 3 is a perspective view of the'lower nut. Fig. 4. is a perspective view of the upper nut.

A represents an ordinary boltprovided with the two nuts B and O. The inner uut B has a radial slot in which a wedge 2 is pivoted. This wedge is so pivoted in the slot and its shape is such that when itis turned to bring the point portion 3 against the threads of the bolt and the outer set-nut C is screwed against B the point of the wedge will be forced into the bolt-threads to lock the inner nut against turning. The outer nut is then locked in position upon B by means of a pivoted latch member -1 on the latter engaging in a longitudinal notch 5 on the periphery of nut C. This notch is formed so that the bottomof it extends as an undercut in the direction of the threads of the nut, whereby al portion 6 of the latterserves as a keeper for the latch l after .the latch has been engaged and the nut turnedslightly as to unscrew it. `The relative locations of the latch and notch on their several nuts are such that when the outer nut O is screwed down flush upon nut B the opening of the notch will coincide with the latch to allow the latter to be turned up into engagement therewith.

In operation the nutB is screwed onto the bolt, theconstruction of the wedge being such that when itis-turned to throw the point outward itwill not interfere with the screwing on or offv of the nut. The wedge is then turned tobring the point or knife-edge of the wedge againstthe threads of the bolt, leaving aportion of the wedge intermediate of thepoint and ,the fulcrum extending a trie above thesurface of the nut. The outer nut C is next screwed down upon B until the adjacent surfaces of the nuts arelin intimate contact, thereby pressing down on the wedge and causing the point to dent in the threads of the bolt. The latch is then engaged in notch 5, as previously described. Thus the inner nut is locked by means of the outer nut and wedge, and the outer nut is locked by means ofthe latch .carried by the inner nut. ItA is tov be noted that advantage is taken of the tendency of the outer nut to loosen. To remove the nuts, the outer one is first tightened to-bring the notch-opening in position to allow the latch to be freed of the keeper 6. When the outer nut has been taken off, the wedge maybe easily turned to permit the inner nut being unscrewed. The same bolts and nuts maybe used repeatedly.

.Having thus described my invention, what I claim, and desire to secure by Letters Patent, is-

l. A nut-locking device consisting in combination of a bolt, inner and outer nuts screwing thereon, a wedge carried by the inner nut and adapted to engage the threads of the bolt when the outer nut is screwed on and means for locking the two nuts together.

2. A nut-lock consisting in combination, of a bolt, inner and outer nuts screwing thereon, a wedge pivoted on one of said nuts and engaging the bolt by contact with the'pther nut, and means carried byone nutengaging the other nut to lock the two together.

3. The combination in a nut-lock, of'a bolt, a nut screwing thereon and having a radial slot, a wedge pivoted in said slot and adapted to be turned so that it engages the threads of the bolt, a latch carried by said nut, and a second nut 'screwing onto the bolt and adapted to engage said Wedge, and having a notch ried by the first-named nut engaging said 1e in which said latch may be engaged. notch.

4. The combination in a nut-lock, of a bolt, In Witness whereof I have hereunto set m a nut screwing thereon, a Wedge pivoted in hand. said nut and adapted to be turned to engage the threads of the bolt, a second nut screw- WALTER A LEWIS' ing on the bolt and engaging said Wedge and Witnesses: having a notch undercut in the direction of JAMES B. HORTON, the threads of said nut, and latch means car- HENRY S. STARRETT. 

